| Company | Timeline | Status | |
| Invertone Limited Director • Metrologist | 29 Aug 2016←7 Years→1 Mar 2024 | Active | |
| Effectech Limited Director • Scientist | 18 Jul 1996←27 Years→1 Mar 2024 | Active | |
| Effectech Limited Secretary • Scientist | 8 Jul 1996←12 Years→1 Jun 2009 | Active | |
